UPS engineers found that left-hand turns were a major drag on efficiency. Turning against traffic resulted in long waits in left-hand turn lanes that wasted time and fuel, and it also led to a disproportionate number of accidents. By mapping out routes that involved "a series of right-hand loops," UPS improved profits and safety while touting their catchy, environmentally friendly policy. As of 2012, the right turn rule combined with other improvements — for the wow factor, UPS doesn't separate them out — saved around 10 million gallons of gas and reduced emissions by the equivalent of taking 5,300 cars of the road for a year.

Describing the policy in a speech, the CEO of UPS told his audience, "I can see a few of you smiling out there, and I know what you may be thinking. But it really works."

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Of course, you can't get rid of left turns entirely. There are occasions when a left turn is fast, safe, or just plain necessary enough to warrant making – which, according to one driver, amounts to about once every ten turns.